240002421 has 4 divisors (see below), whose sum is σ = 320003232. Its totient is φ = 160001612.

The previous prime is 240002377. The next prime is 240002423. The reversal of 240002421 is 124200042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 240002421 - 2⁷ = 240002293 is a prime.

It is a super-2 number, since 2×240002421² = 115202324171722482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 240002421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240002423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40000401 + ... + 40000406.

It is an arithmetic number, because the mean of its divisors is an integer number (80000808).

Almost surely, 2^240002421 is an apocalyptic number.

It is an amenable number.

240002421 is a deficient number, since it is larger than the sum of its proper divisors (80000811).

240002421 is an equidigital number, since it uses as much as digits as its factorization.

240002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80000810.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 240002421 is about 15492.0115220716. The cubic root of 240002421 is about 621.4485907976.

Adding to 240002421 its reverse (124200042), we get a palindrome (364202463).

The spelling of 240002421 in words is "two hundred forty million, two thousand, four hundred twenty-one".